Eruption

This spell can be cast only upon ground with a foundation of earth or natural rock. It causes the area to erupt into geysers of molten rock. Columns of fiery stone burst from the ground and spew deadly lava over everything in the area of effect. Creatures within the area must attempt to move out (unless protected from fire or heat) and take 3d8 points of damage every round they remain in the area. Exposed flammable items are likely to burn. The molten rock sticks to skin and continues to burn, inflicting 1d8 points of damage per round until cooled or until 10 rounds have passed (immersing a creature or dowsing it with water may reduce the duration). The DM adjudicates the effect of this spell on structures; stone fortifications are likely to survive.

The spell leaves a scar of natural, cooling volcanic rock in the area of effect when the spell ends, which will harden into a thin layer of stone.